Thyroid B-ultrasound and urinary iodine content were examined in 4390 male workers aged 18-62 years-old,who participated annual physical checkups in 2009 and 2010.The results suggest that there is no obvious relationship between the urinary iodine which represents the iodine intake within 24 hours and prevalence of thyroidnodale.However,the prevalence of thyroid nodules shows an upward trend with the advance of age.
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